1491915673600 has 351 divisors, whose sum is σ = 4078144180201. Its totient is φ = 540951347200.

The previous prime is 1491915673561. The next prime is 1491915673639. The reversal of 1491915673600 is 63765191941.

The square root of 1491915673600 is 1221440.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (1491915673561) and next prime (1491915673639).

It can be written as a sum of positive squares in only one way, i.e., 537089642496 + 954826031104 = 732864^2 + 977152^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4299468627 + ... + 4299468973.

Almost surely, 2^{1491915673600} is an apocalyptic number.

1491915673600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1491915673600 is the 1221440-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1491915673600

1491915673600 is an abundant number, since it is smaller than the sum of its proper divisors (2586228506601).

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

1491915673600 is an frugal number, since it uses more digits than its factorization.

1491915673600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 1491915673600 in words is "one trillion, four hundred ninety-one billion, nine hundred fifteen million, six hundred seventy-three thousand, six hundred".