164630401649 has 4 divisors (see below), whose sum is σ = 188149030464. Its totient is φ = 141111772836.

The previous prime is 164630401631. The next prime is 164630401757. The reversal of 164630401649 is 946104036461.

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, and also an emirpimes, since its reverse is a distinct semiprime: 946104036461 = 23 ⋅41134958107.

It is a cyclic number.

It is not a de Polignac number, because 164630401649 - 2³² = 160335434353 is a prime.

It is a super-2 number, since 2×164630401649² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164630401619) 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, 11759314397 + ... + 11759314410.

It is an arithmetic number, because the mean of its divisors is an integer number (47037257616).

Almost surely, 2^164630401649 is an apocalyptic number.

It is an amenable number.

164630401649 is a deficient number, since it is larger than the sum of its proper divisors (23518628815).

164630401649 is an equidigital number, since it uses as much as digits as its factorization.

164630401649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23518628814.

The product of its (nonzero) digits is 373248, while the sum is 44.

The spelling of 164630401649 in words is "one hundred sixty-four billion, six hundred thirty million, four hundred one thousand, six hundred forty-nine".