1615651551664 has 80 divisors (see below), whose sum is σ = 3162895293888. Its totient is φ = 799475833856.

The previous prime is 1615651551653. The next prime is 1615651551713. The reversal of 1615651551664 is 4661551565161.

It is a super-2 number, since 2×1615651551664² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

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, 556544037 + ... + 556546939.

Almost surely, 2^{1615651551664} is an apocalyptic number.

It is an amenable number.

1615651551664 is a deficient number, since it is larger than the sum of its proper divisors (1547243742224).

1615651551664 is a wasteful number, since it uses less digits than its factorization.

1615651551664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3982 (or 3976 counting only the distinct ones).

The product of its digits is 3240000, while the sum is 52.

The spelling of 1615651551664 in words is "one trillion, six hundred fifteen billion, six hundred fifty-one million, five hundred fifty-one thousand, six hundred sixty-four".