7861977564261 has 16 divisors (see below), whose sum is σ = 10488777412608. Its totient is φ = 5238248610800.

The previous prime is 7861977564251. The next prime is 7861977564277. The reversal of 7861977564261 is 1624657791687.

It is a cyclic number.

It is not a de Polignac number, because 7861977564261 - 2⁵ = 7861977564229 is a prime.

It is a super-2 number, since 2×7861977564261² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7861977564251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60649726 + ... + 60779216.

It is an arithmetic number, because the mean of its divisors is an integer number (655548588288).

Almost surely, 2^{7861977564261} is an apocalyptic number.

It is an amenable number.

7861977564261 is a deficient number, since it is larger than the sum of its proper divisors (2626799848347).

7861977564261 is a wasteful number, since it uses less digits than its factorization.

7861977564261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141192.

The product of its digits is 213373440, while the sum is 69.

The spelling of 7861977564261 in words is "seven trillion, eight hundred sixty-one billion, nine hundred seventy-seven million, five hundred sixty-four thousand, two hundred sixty-one".