1951811915444 has 12 divisors (see below), whose sum is σ = 3564178280544. Its totient is φ = 933475263864.

The previous prime is 1951811915419. The next prime is 1951811915477. The reversal of 1951811915444 is 4445191181591.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10607673362 + ... + 10607673545.

It is an arithmetic number, because the mean of its divisors is an integer number (297014856712).

Almost surely, 2^{1951811915444} is an apocalyptic number.

It is an amenable number.

1951811915444 is a deficient number, since it is larger than the sum of its proper divisors (1612366365100).

1951811915444 is a wasteful number, since it uses less digits than its factorization.

1951811915444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21215346934 (or 21215346932 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 53.

The spelling of 1951811915444 in words is "one trillion, nine hundred fifty-one billion, eight hundred eleven million, nine hundred fifteen thousand, four hundred forty-four".