649340155 has 4 divisors (see below), whose sum is σ = 779208192. Its totient is φ = 519472120.

The previous prime is 649340129. The next prime is 649340161. The reversal of 649340155 is 551043946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551043946 = 2 ⋅275521973.

It is not a de Polignac number, because 649340155 - 2⁵ = 649340123 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64934011 + ... + 64934020.

It is an arithmetic number, because the mean of its divisors is an integer number (194802048).

Almost surely, 2^649340155 is an apocalyptic number.

649340155 is a deficient number, since it is larger than the sum of its proper divisors (129868037).

649340155 is a wasteful number, since it uses less digits than its factorization.

649340155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129868036.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 649340155 is about 25482.1536570204. The cubic root of 649340155 is about 865.9458863331.

The spelling of 649340155 in words is "six hundred forty-nine million, three hundred forty thousand, one hundred fifty-five".