6157561566 has 16 divisors (see below), whose sum is σ = 13262440464. Its totient is φ = 1894634304.

The previous prime is 6157561559. The next prime is 6157561567. The reversal of 6157561566 is 6651657516.

It is a super-4 number, since 4×6157561566⁴ (a number of 40 digits) contains 4444 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6157561567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39471471 + ... + 39471626.

It is an arithmetic number, because the mean of its divisors is an integer number (828902529).

Almost surely, 2^6157561566 is an apocalyptic number.

6157561566 is an abundant number, since it is smaller than the sum of its proper divisors (7104878898).

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

6157561566 is a wasteful number, since it uses less digits than its factorization.

6157561566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78943115.

The product of its digits is 1134000, while the sum is 48.

The square root of 6157561566 is about 78470.1316807867. The cubic root of 6157561566 is about 1832.8893774674.

The spelling of 6157561566 in words is "six billion, one hundred fifty-seven million, five hundred sixty-one thousand, five hundred sixty-six".