61522548681 has 16 divisors (see below), whose sum is σ = 90620098560. Its totient is φ = 36814411920.

The previous prime is 61522548677. The next prime is 61522548697. The reversal of 61522548681 is 18684522516.

61522548681 = T₁₀₅₇₅₈ + T₁₀₅₇₅₉ + ... + T₁₀₅₇₆₈.

It is not a de Polignac number, because 61522548681 - 2² = 61522548677 is a prime.

It is a super-2 number, since 2×61522548681² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61522548681.

It is not an unprimeable number, because it can be changed into a prime (61522548601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11796885 + ... + 11802098.

It is an arithmetic number, because the mean of its divisors is an integer number (5663756160).

Almost surely, 2^61522548681 is an apocalyptic number.

It is an amenable number.

61522548681 is a deficient number, since it is larger than the sum of its proper divisors (29097549879).

61522548681 is a wasteful number, since it uses less digits than its factorization.

61522548681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23599076.

The product of its digits is 921600, while the sum is 48.

The spelling of 61522548681 in words is "sixty-one billion, five hundred twenty-two million, five hundred forty-eight thousand, six hundred eighty-one".