1581422694916 has 6 divisors (see below), whose sum is σ = 2767489716110. Its totient is φ = 790711347456.

The previous prime is 1581422694877. The next prime is 1581422694949. The reversal of 1581422694916 is 6194962241851.

It can be written as a sum of positive squares in only one way, i.e., 911719425600 + 669703269316 = 954840^2 + 818354^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197677836861 + ... + 197677836868.

Almost surely, 2^{1581422694916} is an apocalyptic number.

It is an amenable number.

1581422694916 is a deficient number, since it is larger than the sum of its proper divisors (1186067021194).

1581422694916 is a wasteful number, since it uses less digits than its factorization.

1581422694916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395355673733 (or 395355673731 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 58.

The spelling of 1581422694916 in words is "one trillion, five hundred eighty-one billion, four hundred twenty-two million, six hundred ninety-four thousand, nine hundred sixteen".