1651661670 has 32 divisors (see below), whose sum is σ = 3995209728. Its totient is φ = 436974048.

The previous prime is 1651661653. The next prime is 1651661677. The reversal of 1651661670 is 761661561.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1651661677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212944 + ... + 220563.

It is an arithmetic number, because the mean of its divisors is an integer number (124850304).

Almost surely, 2^1651661670 is an apocalyptic number.

1651661670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1651661670 is an abundant number, since it is smaller than the sum of its proper divisors (2343548058).

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

1651661670 is a wasteful number, since it uses less digits than its factorization.

1651661670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433644.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 1651661670 is about 40640.6406199509. The cubic root of 1651661670 is about 1182.0622918320.

The spelling of 1651661670 in words is "one billion, six hundred fifty-one million, six hundred sixty-one thousand, six hundred seventy".