1651916994 has 64 divisors (see below), whose sum is σ = 4243083264. Its totient is φ = 416725056.

The previous prime is 1651916993. The next prime is 1651917023. The reversal of 1651916994 is 4996191561.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1651916993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53214 + ... + 78329.

It is an arithmetic number, because the mean of its divisors is an integer number (66298176).

Almost surely, 2^1651916994 is an apocalyptic number.

1651916994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1651916994 is an abundant number, since it is smaller than the sum of its proper divisors (2591166270).

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

1651916994 is a wasteful number, since it uses less digits than its factorization.

1651916994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131591.

The product of its digits is 524880, while the sum is 51.

The square root of 1651916994 is about 40643.7817384160. The cubic root of 1651916994 is about 1182.1231988421.

The spelling of 1651916994 in words is "one billion, six hundred fifty-one million, nine hundred sixteen thousand, nine hundred ninety-four".