649219526401 has 4 divisors (see below), whose sum is σ = 649565041600. Its totient is φ = 648874011204.

The previous prime is 649219526311. The next prime is 649219526407. The reversal of 649219526401 is 104625912946.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 649219526401 - 2¹³ = 649219518209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649219526407) 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, 172754781 + ... + 172758538.

It is an arithmetic number, because the mean of its divisors is an integer number (162391260400).

Almost surely, 2^649219526401 is an apocalyptic number.

It is an amenable number.

649219526401 is a deficient number, since it is larger than the sum of its proper divisors (345515199).

649219526401 is a wasteful number, since it uses less digits than its factorization.

649219526401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345515198.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 649219526401 in words is "six hundred forty-nine billion, two hundred nineteen million, five hundred twenty-six thousand, four hundred one".