61506777325013 has 4 divisors (see below), whose sum is σ = 61537484654688. Its totient is φ = 61476069995340.

The previous prime is 61506777324953. The next prime is 61506777325031. The reversal of 61506777325013 is 31052377760516.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61506777325013 - 2⁴² = 57108730813909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61506777328013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15353661833 + ... + 15353665838.

It is an arithmetic number, because the mean of its divisors is an integer number (15384371163672).

Almost surely, 2^{61506777325013} is an apocalyptic number.

It is an amenable number.

61506777325013 is a deficient number, since it is larger than the sum of its proper divisors (30707329675).

61506777325013 is a wasteful number, since it uses less digits than its factorization.

61506777325013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30707329674.

The product of its (nonzero) digits is 5556600, while the sum is 53.

The spelling of 61506777325013 in words is "sixty-one trillion, five hundred six billion, seven hundred seventy-seven million, three hundred twenty-five thousand, thirteen".