6615520157 has 4 divisors (see below), whose sum is σ = 6621094656. Its totient is φ = 6609945660.

The previous prime is 6615520151. The next prime is 6615520181. The reversal of 6615520157 is 7510255166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6615520157 - 2¹⁴ = 6615503773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6615520157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6615520151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2785469 + ... + 2787842.

It is an arithmetic number, because the mean of its divisors is an integer number (1655273664).

Almost surely, 2^6615520157 is an apocalyptic number.

It is an amenable number.

6615520157 is a deficient number, since it is larger than the sum of its proper divisors (5574499).

6615520157 is a wasteful number, since it uses less digits than its factorization.

6615520157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5574498.

The product of its (nonzero) digits is 63000, while the sum is 38.

The square root of 6615520157 is about 81335.8479208276. The cubic root of 6615520157 is about 1877.2466256070.

The spelling of 6615520157 in words is "six billion, six hundred fifteen million, five hundred twenty thousand, one hundred fifty-seven".