1616507540 has 12 divisors (see below), whose sum is σ = 3394665876. Its totient is φ = 646603008.

The previous prime is 1616507527. The next prime is 1616507569. The reversal of 1616507540 is 457056161.

It can be written as a sum of positive squares in 2 ways, for example, as 596727184 + 1019780356 = 24428^2 + 31934^2 .

It is a super-2 number, since 2×1616507540² = 5226193253753703200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1616507540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40412669 + ... + 40412708.

It is an arithmetic number, because the mean of its divisors is an integer number (282888823).

Almost surely, 2^1616507540 is an apocalyptic number.

1616507540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1616507540 is an abundant number, since it is smaller than the sum of its proper divisors (1778158336).

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

1616507540 is a wasteful number, since it uses less digits than its factorization.

1616507540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80825386 (or 80825384 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 1616507540 is about 40205.8147535901. The cubic root of 1616507540 is about 1173.6157024940.

The spelling of 1616507540 in words is "one billion, six hundred sixteen million, five hundred seven thousand, five hundred forty".