61211536064 has 56 divisors (see below), whose sum is σ = 146984862240. Its totient is φ = 24690364416.

The previous prime is 61211536033. The next prime is 61211536103. The reversal of 61211536064 is 46063511216.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×61211536064² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4010999 + ... + 4026230.

Almost surely, 2^61211536064 is an apocalyptic number.

61211536064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61211536064 is an abundant number, since it is smaller than the sum of its proper divisors (85773326176).

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

61211536064 is a wasteful number, since it uses less digits than its factorization.

61211536064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8037265 (or 8037255 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 61211536064 in words is "sixty-one billion, two hundred eleven million, five hundred thirty-six thousand, sixty-four".