164255780557 has 32 divisors (see below), whose sum is σ = 188554262400. Its totient is φ = 141716064000.

The previous prime is 164255780543. The next prime is 164255780659. The reversal of 164255780557 is 755087552461.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 164255780557 - 2²³ = 164247391949 is a prime.

It is a super-2 number, since 2×164255780557² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164255780498 and 164255780507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164255720557) 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, 4460103 + ... + 4496779.

It is an arithmetic number, because the mean of its divisors is an integer number (5892320700).

Almost surely, 2^164255780557 is an apocalyptic number.

It is an amenable number.

164255780557 is a deficient number, since it is larger than the sum of its proper divisors (24298481843).

164255780557 is a wasteful number, since it uses less digits than its factorization.

164255780557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36957.

The product of its (nonzero) digits is 11760000, while the sum is 55.

The spelling of 164255780557 in words is "one hundred sixty-four billion, two hundred fifty-five million, seven hundred eighty thousand, five hundred fifty-seven".