15646323406 has 32 divisors (see below), whose sum is σ = 27412826112. Its totient is φ = 6558135360.

The previous prime is 15646323401. The next prime is 15646323487. The reversal of 15646323406 is 60432364651.

It is a happy number.

It is a super-2 number, since 2×15646323406² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15646323401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 986370 + ... + 1002106.

It is an arithmetic number, because the mean of its divisors is an integer number (856650816).

Almost surely, 2^15646323406 is an apocalyptic number.

15646323406 is a deficient number, since it is larger than the sum of its proper divisors (11766502706).

15646323406 is a wasteful number, since it uses less digits than its factorization.

15646323406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17304.

The product of its (nonzero) digits is 311040, while the sum is 40.

The spelling of 15646323406 in words is "fifteen billion, six hundred forty-six million, three hundred twenty-three thousand, four hundred six".