620721577472723 has 4 divisors (see below), whose sum is σ = 620721902205048. Its totient is φ = 620721252740400.

The previous prime is 620721577472683. The next prime is 620721577472743. The reversal of 620721577472723 is 327274775127026.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 620721577472723 - 2²⁸ = 620721309037267 is a prime.

It is a super-2 number, since 2×620721577472723² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620721577472743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159481853 + ... + 163327598.

It is an arithmetic number, because the mean of its divisors is an integer number (155180475551262).

Almost surely, 2^{620721577472723} is an apocalyptic number.

620721577472723 is a deficient number, since it is larger than the sum of its proper divisors (324732325).

620721577472723 is a wasteful number, since it uses less digits than its factorization.

620721577472723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324732324.

The product of its (nonzero) digits is 96808320, while the sum is 62.

The spelling of 620721577472723 in words is "six hundred twenty trillion, seven hundred twenty-one billion, five hundred seventy-seven million, four hundred seventy-two thousand, seven hundred twenty-three".