15640422461 has 4 divisors (see below), whose sum is σ = 15643067232. Its totient is φ = 15637777692.

The previous prime is 15640422443. The next prime is 15640422557. The reversal of 15640422461 is 16422404651.

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 15640422461 - 2¹⁴ = 15640406077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15640422401) 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 3 ways as a sum of consecutive naturals, for example, 1313495 + ... + 1325348.

It is an arithmetic number, because the mean of its divisors is an integer number (3910766808).

Almost surely, 2^15640422461 is an apocalyptic number.

It is an amenable number.

15640422461 is a deficient number, since it is larger than the sum of its proper divisors (2644771).

15640422461 is an equidigital number, since it uses as much as digits as its factorization.

15640422461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2644770.

The product of its (nonzero) digits is 46080, while the sum is 35.

The spelling of 15640422461 in words is "fifteen billion, six hundred forty million, four hundred twenty-two thousand, four hundred sixty-one".