164491786501 has 8 divisors (see below), whose sum is σ = 194473048320. Its totient is φ = 136131133488.

The previous prime is 164491786451. The next prime is 164491786519. The reversal of 164491786501 is 105687194461.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 164491786501 - 2¹¹ = 164491784453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164491786541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405151981 + ... + 405152386.

It is an arithmetic number, because the mean of its divisors is an integer number (24309131040).

Almost surely, 2^164491786501 is an apocalyptic number.

It is an amenable number.

164491786501 is a deficient number, since it is larger than the sum of its proper divisors (29981261819).

164491786501 is an equidigital number, since it uses as much as digits as its factorization.

164491786501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810304403.

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 164491786501 in words is "one hundred sixty-four billion, four hundred ninety-one million, seven hundred eighty-six thousand, five hundred one".