61651440625 has 24 divisors (see below), whose sum is σ = 77108049144. Its totient is φ = 49290000000.

The previous prime is 61651440607. The next prime is 61651440649. The reversal of 61651440625 is 52604415616.

It can be written as a sum of positive squares in 12 ways, for example, as 60431405584 + 1220035041 = 245828^2 + 34929^2 .

It is not a de Polignac number, because 61651440625 - 2¹⁹ = 61650916337 is a prime.

It is a super-2 number, since 2×61651440625² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5810325 + ... + 5820925.

It is an arithmetic number, because the mean of its divisors is an integer number (3212835381).

Almost surely, 2^61651440625 is an apocalyptic number.

It is an amenable number.

61651440625 is a deficient number, since it is larger than the sum of its proper divisors (15456608519).

61651440625 is an equidigital number, since it uses as much as digits as its factorization.

61651440625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12487 (or 12467 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 61651440625 in words is "sixty-one billion, six hundred fifty-one million, four hundred forty thousand, six hundred twenty-five".