6520616797381 has 4 divisors (see below), whose sum is σ = 6804121875552. Its totient is φ = 6237111719212.

The previous prime is 6520616797367. The next prime is 6520616797393. The reversal of 6520616797381 is 1837976160256.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6520616797381 - 2¹³ = 6520616789189 is a prime.

It is a super-2 number, since 2×6520616797381² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6520616797351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141752539051 + ... + 141752539096.

It is an arithmetic number, because the mean of its divisors is an integer number (1701030468888).

Almost surely, 2^{6520616797381} is an apocalyptic number.

It is an amenable number.

6520616797381 is a deficient number, since it is larger than the sum of its proper divisors (283505078171).

6520616797381 is a wasteful number, since it uses less digits than its factorization.

6520616797381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283505078170.

The product of its (nonzero) digits is 22861440, while the sum is 61.

The spelling of 6520616797381 in words is "six trillion, five hundred twenty billion, six hundred sixteen million, seven hundred ninety-seven thousand, three hundred eighty-one".