1651201668 has 36 divisors (see below), whose sum is σ = 4224166128. Its totient is φ = 543768240.

The previous prime is 1651201661. The next prime is 1651201691. The reversal of 1651201668 is 8661021561.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1651201661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 273318 + ... + 279293.

It is an arithmetic number, because the mean of its divisors is an integer number (117337948).

Almost surely, 2^1651201668 is an apocalyptic number.

1651201668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1651201668 is an abundant number, since it is smaller than the sum of its proper divisors (2572964460).

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

1651201668 is a wasteful number, since it uses less digits than its factorization.

1651201668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552704 (or 552699 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1651201668 is about 40634.9808416345. The cubic root of 1651201668 is about 1181.9525434665.

The spelling of 1651201668 in words is "one billion, six hundred fifty-one million, two hundred one thousand, six hundred sixty-eight".