1661053620 has 48 divisors (see below), whose sum is σ = 4660987968. Its totient is φ = 441991680.

The previous prime is 1661053601. The next prime is 1661053631. The reversal of 1661053620 is 263501661.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1621 + ... + 57660.

It is an arithmetic number, because the mean of its divisors is an integer number (97103916).

Almost surely, 2^1661053620 is an apocalyptic number.

1661053620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661053620 is an abundant number, since it is smaller than the sum of its proper divisors (2999934348).

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

1661053620 is a wasteful number, since it uses less digits than its factorization.

1661053620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59760 (or 59758 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 1661053620 is about 40756.0255667797. The cubic root of 1661053620 is about 1184.2986039607.

The spelling of 1661053620 in words is "one billion, six hundred sixty-one million, fifty-three thousand, six hundred twenty".