66928501 has 4 divisors (see below), whose sum is σ = 67279104. Its totient is φ = 66577900.

The previous prime is 66928489. The next prime is 66928553. The reversal of 66928501 is 10582966.

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 66928501 - 2¹⁵ = 66895733 is a prime.

It is a super-2 number, since 2×66928501² = 8958848492214002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66928591) 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, 175015 + ... + 175396.

It is an arithmetic number, because the mean of its divisors is an integer number (16819776).

Almost surely, 2^66928501 is an apocalyptic number.

It is an amenable number.

66928501 is a deficient number, since it is larger than the sum of its proper divisors (350603).

66928501 is a wasteful number, since it uses less digits than its factorization.

66928501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350602.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 66928501 is about 8180.9841095066. The cubic root of 66928501 is about 406.0102826875.

The spelling of 66928501 in words is "sixty-six million, nine hundred twenty-eight thousand, five hundred one".