155206783681 has 8 divisors (see below), whose sum is σ = 155524895424. Its totient is φ = 154888996080.

The previous prime is 155206783657. The next prime is 155206783703. The reversal of 155206783681 is 186387602551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155206783681 - 2⁷ = 155206783553 is a prime.

It is a super-2 number, since 2×155206783681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155206783181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 889446 + ... + 1049536.

It is an arithmetic number, because the mean of its divisors is an integer number (19440611928).

Almost surely, 2^155206783681 is an apocalyptic number.

It is an amenable number.

155206783681 is a deficient number, since it is larger than the sum of its proper divisors (318111743).

155206783681 is a wasteful number, since it uses less digits than its factorization.

155206783681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162071.

The product of its (nonzero) digits is 2419200, while the sum is 52.

The spelling of 155206783681 in words is "one hundred fifty-five billion, two hundred six million, seven hundred eighty-three thousand, six hundred eighty-one".