7921571400849 has 32 divisors (see below), whose sum is σ = 11644514380800. Its totient is φ = 4767781296960.

The previous prime is 7921571400833. The next prime is 7921571400857. The reversal of 7921571400849 is 9480041751297.

It is not a de Polignac number, because 7921571400849 - 2⁴ = 7921571400833 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (7921571400829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10878547 + ... + 11583864.

It is an arithmetic number, because the mean of its divisors is an integer number (363891074400).

Almost surely, 2^{7921571400849} is an apocalyptic number.

It is an amenable number.

7921571400849 is a deficient number, since it is larger than the sum of its proper divisors (3722942979951).

7921571400849 is a wasteful number, since it uses less digits than its factorization.

7921571400849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22462725.

The product of its (nonzero) digits is 5080320, while the sum is 57.

The spelling of 7921571400849 in words is "seven trillion, nine hundred twenty-one billion, five hundred seventy-one million, four hundred thousand, eight hundred forty-nine".