649711727421 has 8 divisors (see below), whose sum is σ = 866297126400. Its totient is φ = 433133740032.

The previous prime is 649711727393. The next prime is 649711727449. The reversal of 649711727421 is 124727117946.

It is an interprime number because it is at equal distance from previous prime (649711727393) and next prime (649711727449).

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

It is not a de Polignac number, because 649711727421 - 2⁷ = 649711727293 is a prime.

It is a super-2 number, since 2×649711727421² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649711727491) 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, 1645021 + ... + 2001378.

It is an arithmetic number, because the mean of its divisors is an integer number (108287140800).

Almost surely, 2^649711727421 is an apocalyptic number.

It is an amenable number.

649711727421 is a deficient number, since it is larger than the sum of its proper divisors (216585398979).

649711727421 is a wasteful number, since it uses less digits than its factorization.

649711727421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3705795.

The product of its digits is 1185408, while the sum is 51.

The spelling of 649711727421 in words is "six hundred forty-nine billion, seven hundred eleven million, seven hundred twenty-seven thousand, four hundred twenty-one".