918572740921 has 4 divisors (see below), whose sum is σ = 1002079353744. Its totient is φ = 835066128100.

The previous prime is 918572740919. The next prime is 918572740951. The reversal of 918572740921 is 129047275819.

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 918572740921 - 2¹ = 918572740919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (918572740951) 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, 41753306395 + ... + 41753306416.

It is an arithmetic number, because the mean of its divisors is an integer number (250519838436).

Almost surely, 2^918572740921 is an apocalyptic number.

It is an amenable number.

918572740921 is a deficient number, since it is larger than the sum of its proper divisors (83506612823).

918572740921 is a wasteful number, since it uses less digits than its factorization.

918572740921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83506612822.

The product of its (nonzero) digits is 2540160, while the sum is 55.

The spelling of 918572740921 in words is "nine hundred eighteen billion, five hundred seventy-two million, seven hundred forty thousand, nine hundred twenty-one".