61630445651 has 4 divisors (see below), whose sum is σ = 61704789600. Its totient is φ = 61556101704.

The previous prime is 61630445647. The next prime is 61630445659. The reversal of 61630445651 is 15654403616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61630445651 - 2² = 61630445647 is a prime.

It is a super-2 number, since 2×61630445651² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61630445599 and 61630445608.

It is not an unprimeable number, because it can be changed into a prime (61630445659) 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, 37170731 + ... + 37172388.

It is an arithmetic number, because the mean of its divisors is an integer number (15426197400).

Almost surely, 2^61630445651 is an apocalyptic number.

61630445651 is a deficient number, since it is larger than the sum of its proper divisors (74343949).

61630445651 is an equidigital number, since it uses as much as digits as its factorization.

61630445651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74343948.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 61630445651 in words is "sixty-one billion, six hundred thirty million, four hundred forty-five thousand, six hundred fifty-one".