166622405501 has 4 divisors (see below), whose sum is σ = 168179624352. Its totient is φ = 165065186652.

The previous prime is 166622405483. The next prime is 166622405503. The reversal of 166622405501 is 105504226661.

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 166622405501 - 2¹⁴ = 166622389117 is a prime.

It is a super-2 number, since 2×166622405501² (a number of 23 digits) 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 (166622405503) 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, 778609265 + ... + 778609478.

It is an arithmetic number, because the mean of its divisors is an integer number (42044906088).

Almost surely, 2^166622405501 is an apocalyptic number.

It is an amenable number.

166622405501 is a deficient number, since it is larger than the sum of its proper divisors (1557218851).

166622405501 is a wasteful number, since it uses less digits than its factorization.

166622405501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557218850.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 166622405501 in words is "one hundred sixty-six billion, six hundred twenty-two million, four hundred five thousand, five hundred one".