61520812685 has 8 divisors (see below), whose sum is σ = 73857960960. Its totient is φ = 49194659664.

The previous prime is 61520812669. The next prime is 61520812687. The reversal of 61520812685 is 58621802516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61520812685 - 2⁴ = 61520812669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61520812687) 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 7 ways as a sum of consecutive naturals, for example, 2736497 + ... + 2758886.

It is an arithmetic number, because the mean of its divisors is an integer number (9232245120).

Almost surely, 2^61520812685 is an apocalyptic number.

It is an amenable number.

61520812685 is a deficient number, since it is larger than the sum of its proper divisors (12337148275).

61520812685 is a wasteful number, since it uses less digits than its factorization.

61520812685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5497627.

The product of its (nonzero) digits is 230400, while the sum is 44.

The spelling of 61520812685 in words is "sixty-one billion, five hundred twenty million, eight hundred twelve thousand, six hundred eighty-five".