1497638726640 has 240 divisors, whose sum is σ = 5817335666688. Its totient is φ = 338193022464.

The previous prime is 1497638726609. The next prime is 1497638726641. The reversal of 1497638726640 is 466278367941.

It is a happy number.

1497638726640 is a `hidden beast` number, since 1 + 497 + 6 + 3 + 87 + 2 + 6 + 64 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1497638726641) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1371744 + ... + 2208383.

Almost surely, 2^{1497638726640} is an apocalyptic number.

1497638726640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1497638726640 is an abundant number, since it is smaller than the sum of its proper divisors (4319696940048).

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

1497638726640 is a wasteful number, since it uses less digits than its factorization.

1497638726640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3580236 (or 3580227 counting only the distinct ones).

The product of its (nonzero) digits is 73156608, while the sum is 63.

The spelling of 1497638726640 in words is "one trillion, four hundred ninety-seven billion, six hundred thirty-eight million, seven hundred twenty-six thousand, six hundred forty".