6620915973531 has 8 divisors (see below), whose sum is σ = 8828695166544. Its totient is φ = 4413540381440.

The previous prime is 6620915973509. The next prime is 6620915973559. The reversal of 6620915973531 is 1353795190266.

6620915973531 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6620915973531 - 2⁹ = 6620915973019 is a prime.

It is a super-2 number, since 2×6620915973531² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6620915977531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100861950 + ... + 100927571.

It is an arithmetic number, because the mean of its divisors is an integer number (1103586895818).

Almost surely, 2^{6620915973531} is an apocalyptic number.

6620915973531 is a deficient number, since it is larger than the sum of its proper divisors (2207779193013).

6620915973531 is a wasteful number, since it uses less digits than its factorization.

6620915973531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201800461.

The product of its (nonzero) digits is 9185400, while the sum is 57.

The spelling of 6620915973531 in words is "six trillion, six hundred twenty billion, nine hundred fifteen million, nine hundred seventy-three thousand, five hundred thirty-one".