161215570007 has 4 divisors (see below), whose sum is σ = 168224942640. Its totient is φ = 154206197376.

The previous prime is 161215570003. The next prime is 161215570013. The reversal of 161215570007 is 700075512161.

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 161215570007 - 2² = 161215570003 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 (161215570003) 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, 3504686282 + ... + 3504686327.

It is an arithmetic number, because the mean of its divisors is an integer number (42056235660).

Almost surely, 2^161215570007 is an apocalyptic number.

161215570007 is a deficient number, since it is larger than the sum of its proper divisors (7009372633).

161215570007 is an equidigital number, since it uses as much as digits as its factorization.

161215570007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7009372632.

The product of its (nonzero) digits is 14700, while the sum is 35.

The spelling of 161215570007 in words is "one hundred sixty-one billion, two hundred fifteen million, five hundred seventy thousand, seven".