161237512619 has 4 divisors (see below), whose sum is σ = 165170134920. Its totient is φ = 157304890320.

The previous prime is 161237512603. The next prime is 161237512649. The reversal of 161237512619 is 916215732161.

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 161237512619 - 2⁴ = 161237512603 is a prime.

It is a super-3 number, since 3×161237512619³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161237512619.

It is not an unprimeable number, because it can be changed into a prime (161237512649) 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, 1966311089 + ... + 1966311170.

It is an arithmetic number, because the mean of its divisors is an integer number (41292533730).

Almost surely, 2^161237512619 is an apocalyptic number.

161237512619 is a deficient number, since it is larger than the sum of its proper divisors (3932622301).

161237512619 is an equidigital number, since it uses as much as digits as its factorization.

161237512619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3932622300.

The product of its digits is 136080, while the sum is 44.

The spelling of 161237512619 in words is "one hundred sixty-one billion, two hundred thirty-seven million, five hundred twelve thousand, six hundred nineteen".