61626731017 has 4 divisors (see below), whose sum is σ = 62494713216. Its totient is φ = 60758748820.

The previous prime is 61626731011. The next prime is 61626731027. The reversal of 61626731017 is 71013762616.

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 a de Polignac number, because none of the positive numbers 2^k-61626731017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61626731011) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 433990993 + ... + 433991134.

It is an arithmetic number, because the mean of its divisors is an integer number (15623678304).

Almost surely, 2^61626731017 is an apocalyptic number.

It is an amenable number.

61626731017 is a deficient number, since it is larger than the sum of its proper divisors (867982199).

61626731017 is an equidigital number, since it uses as much as digits as its factorization.

61626731017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867982198.

The product of its (nonzero) digits is 63504, while the sum is 40.

The spelling of 61626731017 in words is "sixty-one billion, six hundred twenty-six million, seven hundred thirty-one thousand, seventeen".