7901220018690 has 64 divisors (see below), whose sum is σ = 21070353553920. Its totient is φ = 2106948654720.

The previous prime is 7901220018631. The next prime is 7901220018697. The reversal of 7901220018690 is 968100221097.

It is a super-2 number, since 2×7901220018690² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (7901220018697) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14123910 + ... + 14672670.

It is an arithmetic number, because the mean of its divisors is an integer number (329224274280).

Almost surely, 2^{7901220018690} is an apocalyptic number.

7901220018690 is an abundant number, since it is smaller than the sum of its proper divisors (13169133535230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7901220018690 is a wasteful number, since it uses less digits than its factorization.

7901220018690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602104 (or 602098 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 7901220018690 in words is "seven trillion, nine hundred one billion, two hundred twenty million, eighteen thousand, six hundred ninety".