7661052581 has 32 divisors (see below), whose sum is σ = 9673267968. Its totient is φ = 5904898560.

The previous prime is 7661052563. The next prime is 7661052587. The reversal of 7661052581 is 1852501667.

It is a de Polignac number, because none of the positive numbers 2^k-7661052581 is a prime.

It is a super-2 number, since 2×7661052581² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7661052587) 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, 3778490 + ... + 3780516.

It is an arithmetic number, because the mean of its divisors is an integer number (302289624).

Almost surely, 2^7661052581 is an apocalyptic number.

It is an amenable number.

7661052581 is a deficient number, since it is larger than the sum of its proper divisors (2012215387).

7661052581 is a wasteful number, since it uses less digits than its factorization.

7661052581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3101.

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 7661052581 is about 87527.4390177160. The cubic root of 7661052581 is about 1971.3458110513.

The spelling of 7661052581 in words is "seven billion, six hundred sixty-one million, fifty-two thousand, five hundred eighty-one".