161665363002 has 64 divisors (see below), whose sum is σ = 382630034304. Its totient is φ = 44890967040.

The previous prime is 161665362973. The next prime is 161665363031. The reversal of 161665363002 is 200363566161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (161665362973) and next prime (161665363031).

It is a super-2 number, since 2×161665363002² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 570123 + ... + 805214.

It is an arithmetic number, because the mean of its divisors is an integer number (5978594286).

Almost surely, 2^161665363002 is an apocalyptic number.

161665363002 is an abundant number, since it is smaller than the sum of its proper divisors (220964671302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161665363002 is a wasteful number, since it uses less digits than its factorization.

161665363002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375503.

The product of its (nonzero) digits is 116640, while the sum is 39.

The spelling of 161665363002 in words is "one hundred sixty-one billion, six hundred sixty-five million, three hundred sixty-three thousand, two".