1974816691461 has 80 divisors (see below), whose sum is σ = 3164870966400. Its totient is φ = 1227045096576.

The previous prime is 1974816691391. The next prime is 1974816691469. The reversal of 1974816691461 is 1641966184791.

1974816691461 is a `hidden beast` number, since 1 + 9 + 7 + 4 + 8 + 166 + 9 + 1 + 461 = 666.

It is not a de Polignac number, because 1974816691461 - 2¹⁴ = 1974816675077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1974816691469) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 40965070 + ... + 41013248.

It is an arithmetic number, because the mean of its divisors is an integer number (39560887080).

Almost surely, 2^{1974816691461} is an apocalyptic number.

It is an amenable number.

1974816691461 is a deficient number, since it is larger than the sum of its proper divisors (1190054274939).

1974816691461 is an equidigital number, since it uses as much as digits as its factorization.

1974816691461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48345 (or 48302 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 63.

The spelling of 1974816691461 in words is "one trillion, nine hundred seventy-four billion, eight hundred sixteen million, six hundred ninety-one thousand, four hundred sixty-one".