45515551221 has 48 divisors (see below), whose sum is σ = 77208453504. Its totient is φ = 25292518272.

The previous prime is 45515551219. The next prime is 45515551223. The reversal of 45515551221 is 12215551554.

45515551221 is a `hidden beast` number, since 4 + 551 + 55 + 51 + 2 + 2 + 1 = 666.

45515551221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (45515551219) and next prime (45515551223).

It is not a de Polignac number, because 45515551221 - 2¹ = 45515551219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45515551223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5769946 + ... + 5777828.

It is an arithmetic number, because the mean of its divisors is an integer number (1608509448).

Almost surely, 2^45515551221 is an apocalyptic number.

It is an amenable number.

45515551221 is a deficient number, since it is larger than the sum of its proper divisors (31692902283).

45515551221 is a wasteful number, since it uses less digits than its factorization.

45515551221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10410 (or 10407 counting only the distinct ones).

The product of its digits is 50000, while the sum is 36.

The spelling of 45515551221 in words is "forty-five billion, five hundred fifteen million, five hundred fifty-one thousand, two hundred twenty-one".