161624700077 has 4 divisors (see below), whose sum is σ = 161791841376. Its totient is φ = 161457558780.

The previous prime is 161624700043. The next prime is 161624700089. The reversal of 161624700077 is 770007426161.

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: 770007426161 = 31 ⋅24838949231.

It is a cyclic number.

It is not a de Polignac number, because 161624700077 - 2¹⁰ = 161624699053 is a prime.

It is a super-2 number, since 2×161624700077² (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 (161624700577) 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, 83569199 + ... + 83571132.

It is an arithmetic number, because the mean of its divisors is an integer number (40447960344).

Almost surely, 2^161624700077 is an apocalyptic number.

It is an amenable number.

161624700077 is a deficient number, since it is larger than the sum of its proper divisors (167141299).

161624700077 is an equidigital number, since it uses as much as digits as its factorization.

161624700077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167141298.

The product of its (nonzero) digits is 98784, while the sum is 41.

The spelling of 161624700077 in words is "one hundred sixty-one billion, six hundred twenty-four million, seven hundred thousand, seventy-seven".