61351506631 has 16 divisors (see below), whose sum is σ = 62521430400. Its totient is φ = 60193663488.

The previous prime is 61351506551. The next prime is 61351506661. The reversal of 61351506631 is 13660515316.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61351506631 is a prime.

It is a super-2 number, since 2×61351506631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61351506661) 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, 19668690 + ... + 19671808.

It is an arithmetic number, because the mean of its divisors is an integer number (3907589400).

Almost surely, 2^61351506631 is an apocalyptic number.

61351506631 is a deficient number, since it is larger than the sum of its proper divisors (1169923769).

61351506631 is a wasteful number, since it uses less digits than its factorization.

61351506631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4938.

The product of its (nonzero) digits is 48600, while the sum is 37.

The spelling of 61351506631 in words is "sixty-one billion, three hundred fifty-one million, five hundred six thousand, six hundred thirty-one".