745570811521 has 8 divisors (see below), whose sum is σ = 746837552160. Its totient is φ = 744304405152.

The previous prime is 745570811477. The next prime is 745570811533. The reversal of 745570811521 is 125118075547.

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 745570811521 - 2¹⁹ = 745570287233 is a prime.

It is a super-3 number, since 3×745570811521³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745570811561) 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, 4603365 + ... + 4762573.

It is an arithmetic number, because the mean of its divisors is an integer number (93354694020).

Almost surely, 2^745570811521 is an apocalyptic number.

It is an amenable number.

745570811521 is a deficient number, since it is larger than the sum of its proper divisors (1266740639).

745570811521 is a wasteful number, since it uses less digits than its factorization.

745570811521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167135.

The product of its (nonzero) digits is 392000, while the sum is 46.

The spelling of 745570811521 in words is "seven hundred forty-five billion, five hundred seventy million, eight hundred eleven thousand, five hundred twenty-one".