1953911971138 has 16 divisors (see below), whose sum is σ = 2986086902400. Its totient is φ = 958707664816.

The previous prime is 1953911971133. The next prime is 1953911971183. The reversal of 1953911971138 is 8311791193591.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1953911971133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39473770 + ... + 39523237.

It is an arithmetic number, because the mean of its divisors is an integer number (186630431400).

Almost surely, 2^{1953911971138} is an apocalyptic number.

1953911971138 is a deficient number, since it is larger than the sum of its proper divisors (1032174931262).

1953911971138 is a wasteful number, since it uses less digits than its factorization.

1953911971138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78997241.

The product of its digits is 1837080, while the sum is 58.

The spelling of 1953911971138 in words is "one trillion, nine hundred fifty-three billion, nine hundred eleven million, nine hundred seventy-one thousand, one hundred thirty-eight".