7971487546555 has 16 divisors (see below), whose sum is σ = 10303261615584. Its totient is φ = 5885695848960.

The previous prime is 7971487546543. The next prime is 7971487546559. The reversal of 7971487546555 is 5556457841797.

It is not a de Polignac number, because 7971487546555 - 2¹³ = 7971487538363 is a prime.

It is a super-2 number, since 2×7971487546555² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7971487546559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9393381 + ... + 10206790.

It is an arithmetic number, because the mean of its divisors is an integer number (643953850974).

Almost surely, 2^{7971487546555} is an apocalyptic number.

7971487546555 is a deficient number, since it is larger than the sum of its proper divisors (2331774069029).

7971487546555 is a wasteful number, since it uses less digits than its factorization.

7971487546555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19606446.

The product of its digits is 1481760000, while the sum is 73.

The spelling of 7971487546555 in words is "seven trillion, nine hundred seventy-one billion, four hundred eighty-seven million, five hundred forty-six thousand, five hundred fifty-five".