1649555665170 has 128 divisors (see below), whose sum is σ = 4765763174400. Its totient is φ = 364878601920.

The previous prime is 1649555665159. The next prime is 1649555665181. The reversal of 1649555665170 is 715665559461.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1649555665159) and next prime (1649555665181).

It is a super-2 number, since 2×1649555665170² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2266602 + ... + 2904581.

It is an arithmetic number, because the mean of its divisors is an integer number (37232524800).

Almost surely, 2^{1649555665170} is an apocalyptic number.

1649555665170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1649555665170 is an abundant number, since it is smaller than the sum of its proper divisors (3116207509230).

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

1649555665170 is a wasteful number, since it uses less digits than its factorization.

1649555665170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5171245 (or 5171231 counting only the distinct ones).

The product of its (nonzero) digits is 34020000, while the sum is 60.

The spelling of 1649555665170 in words is "one trillion, six hundred forty-nine billion, five hundred fifty-five million, six hundred sixty-five thousand, one hundred seventy".