1651949488721 has 8 divisors (see below), whose sum is σ = 1896259200960. Its totient is φ = 1409719008528.

The previous prime is 1651949488691. The next prime is 1651949488751. The reversal of 1651949488721 is 1278849491561.

It is an interprime number because it is at equal distance from previous prime (1651949488691) and next prime (1651949488751).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1651949488721 - 2¹⁴ = 1651949472337 is a prime.

It is a super-3 number, since 3×1651949488721³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1651949488751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519806306 + ... + 519809483.

It is an arithmetic number, because the mean of its divisors is an integer number (237032400120).

Almost surely, 2^{1651949488721} is an apocalyptic number.

It is an amenable number.

1651949488721 is a deficient number, since it is larger than the sum of its proper divisors (244309712239).

1651949488721 is a wasteful number, since it uses less digits than its factorization.

1651949488721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039616023.

The product of its digits is 34836480, while the sum is 65.

The spelling of 1651949488721 in words is "one trillion, six hundred fifty-one billion, nine hundred forty-nine million, four hundred eighty-eight thousand, seven hundred twenty-one".