19951346971649 has 32 divisors (see below), whose sum is σ = 20914804485120. Its totient is φ = 19007695913472.

The previous prime is 19951346971639. The next prime is 19951346971651. The reversal of 19951346971649 is 94617964315991.

It is not a de Polignac number, because 19951346971649 - 2⁸ = 19951346971393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19951346971639) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1356027917 + ... + 1356042629.

It is an arithmetic number, because the mean of its divisors is an integer number (653587640160).

Almost surely, 2^{19951346971649} is an apocalyptic number.

It is an amenable number.

19951346971649 is a deficient number, since it is larger than the sum of its proper divisors (963457513471).

19951346971649 is a wasteful number, since it uses less digits than its factorization.

19951346971649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16449.

The product of its digits is 396809280, while the sum is 74.

The spelling of 19951346971649 in words is "nineteen trillion, nine hundred fifty-one billion, three hundred forty-six million, nine hundred seventy-one thousand, six hundred forty-nine".