1973791469651 has 4 divisors (see below), whose sum is σ = 1973796255000. Its totient is φ = 1973786684304.

The previous prime is 1973791469623. The next prime is 1973791469669. The reversal of 1973791469651 is 1569641973791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1973791469651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1973791469681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1708826 + ... + 2620623.

It is an arithmetic number, because the mean of its divisors is an integer number (493449063750).

Almost surely, 2^{1973791469651} is an apocalyptic number.

1973791469651 is a deficient number, since it is larger than the sum of its proper divisors (4785349).

1973791469651 is an equidigital number, since it uses as much as digits as its factorization.

1973791469651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4785348.

The product of its digits is 77157360, while the sum is 68.

It can be divided in two parts, 1973791 and 469651, that added together give a palindrome (2443442).

The spelling of 1973791469651 in words is "one trillion, nine hundred seventy-three billion, seven hundred ninety-one million, four hundred sixty-nine thousand, six hundred fifty-one".