161373762447511 has 4 divisors (see below), whose sum is σ = 161852616342352. Its totient is φ = 160894908552672.

The previous prime is 161373762447497. The next prime is 161373762447587. The reversal of 161373762447511 is 115744267373161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161373762447511 - 2⁷ = 161373762447383 is a prime.

It is a super-2 number, since 2×161373762447511² (a number of 29 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 (161373462447511) 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, 239426946915 + ... + 239426947588.

It is an arithmetic number, because the mean of its divisors is an integer number (40463154085588).

Almost surely, 2^{161373762447511} is an apocalyptic number.

161373762447511 is a deficient number, since it is larger than the sum of its proper divisors (478853894841).

161373762447511 is an equidigital number, since it uses as much as digits as its factorization.

161373762447511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478853894840.

The product of its digits is 17781120, while the sum is 58.

The spelling of 161373762447511 in words is "one hundred sixty-one trillion, three hundred seventy-three billion, seven hundred sixty-two million, four hundred forty-seven thousand, five hundred eleven".