740041556621 has 4 divisors (see below), whose sum is σ = 740148707232. Its totient is φ = 739934406012.

The previous prime is 740041556603. The next prime is 740041556623. The reversal of 740041556621 is 126655140047.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 126655140047 = 359 ⋅352799833.

It is a cyclic number.

It is not a de Polignac number, because 740041556621 - 2¹⁸ = 740041294477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (740041556623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53564945 + ... + 53578758.

It is an arithmetic number, because the mean of its divisors is an integer number (185037176808).

Almost surely, 2^740041556621 is an apocalyptic number.

It is an amenable number.

740041556621 is a deficient number, since it is larger than the sum of its proper divisors (107150611).

740041556621 is a wasteful number, since it uses less digits than its factorization.

740041556621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107150610.

The product of its (nonzero) digits is 201600, while the sum is 41.

Adding to 740041556621 its reverse (126655140047), we get a palindrome (866696696668).

The spelling of 740041556621 in words is "seven hundred forty billion, forty-one million, five hundred fifty-six thousand, six hundred twenty-one".