66021357 has 32 divisors (see below), whose sum is σ = 94227840. Its totient is φ = 41057280.

The previous prime is 66021349. The next prime is 66021359. The reversal of 66021357 is 75312066.

It is not a de Polignac number, because 66021357 - 2³ = 66021349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66021359) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 404958 + ... + 405120.

It is an arithmetic number, because the mean of its divisors is an integer number (2944620).

Almost surely, 2^66021357 is an apocalyptic number.

It is an amenable number.

66021357 is a deficient number, since it is larger than the sum of its proper divisors (28206483).

66021357 is a wasteful number, since it uses less digits than its factorization.

66021357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 66021357 is about 8125.3527308050. The cubic root of 66021357 is about 404.1675876457.

The spelling of 66021357 in words is "sixty-six million, twenty-one thousand, three hundred fifty-seven".