161771878270 has 64 divisors (see below), whose sum is σ = 307138547520. Its totient is φ = 61253756928.

The previous prime is 161771878249. The next prime is 161771878283. The reversal of 161771878270 is 72878177161.

It is a happy number.

It is a super-3 number, since 3×161771878270³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

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, 27309529 + ... + 27315451.

It is an arithmetic number, because the mean of its divisors is an integer number (4799039805).

Almost surely, 2^161771878270 is an apocalyptic number.

161771878270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161771878270 is a deficient number, since it is larger than the sum of its proper divisors (145366669250).

161771878270 is a wasteful number, since it uses less digits than its factorization.

161771878270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7789.

The product of its (nonzero) digits is 1843968, while the sum is 55.

The spelling of 161771878270 in words is "one hundred sixty-one billion, seven hundred seventy-one million, eight hundred seventy-eight thousand, two hundred seventy".