1656656540 has 96 divisors (see below), whose sum is σ = 4380784128. Its totient is φ = 511200000.

The previous prime is 1656656503. The next prime is 1656656549. The reversal of 1656656540 is 456566561.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 1656656491 and 1656656500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656656549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150215 + ... + 160865.

It is an arithmetic number, because the mean of its divisors is an integer number (45633168).

Almost surely, 2^1656656540 is an apocalyptic number.

1656656540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1656656540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2190392064).

1656656540 is an abundant number, since it is smaller than the sum of its proper divisors (2724127588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1656656540 is a wasteful number, since it uses less digits than its factorization.

1656656540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10779 (or 10777 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 44.

The square root of 1656656540 is about 40702.0458945248. The cubic root of 1656656540 is about 1183.2526699408.

The spelling of 1656656540 in words is "one billion, six hundred fifty-six million, six hundred fifty-six thousand, five hundred forty".