7251640018778 has 16 divisors (see below), whose sum is σ = 10933979711040. Its totient is φ = 3606980664576.

The previous prime is 7251640018729. The next prime is 7251640018783. The reversal of 7251640018778 is 8778100461527.

It is a super-2 number, since 2×7251640018778² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49994483 + ... + 50139321.

It is an arithmetic number, because the mean of its divisors is an integer number (683373731940).

Almost surely, 2^{7251640018778} is an apocalyptic number.

7251640018778 is a deficient number, since it is larger than the sum of its proper divisors (3682339692262).

7251640018778 is a wasteful number, since it uses less digits than its factorization.

7251640018778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274741.

The product of its (nonzero) digits is 5268480, while the sum is 56.

The spelling of 7251640018778 in words is "seven trillion, two hundred fifty-one billion, six hundred forty million, eighteen thousand, seven hundred seventy-eight".