649025195641 has 9 divisors (see below), whose sum is σ = 678489943621. Its totient is φ = 620788985212.

The previous prime is 649025195491. The next prime is 649025195653. The reversal of 649025195641 is 146591520946.

The square root of 649025195641 is 805621.

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

It is not a de Polignac number, because 649025195641 - 2³¹ = 646877711993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649025195671) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 18511770 + ... + 18546796.

Almost surely, 2^649025195641 is an apocalyptic number.

649025195641 is the 805621-st square number.

649025195641 is the 402811-st centered octagonal number.

It is an amenable number.

649025195641 is a deficient number, since it is larger than the sum of its proper divisors (29464747980).

649025195641 is an frugal number, since it uses more digits than its factorization.

649025195641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70100 (or 35050 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 649025195641 in words is "six hundred forty-nine billion, twenty-five million, one hundred ninety-five thousand, six hundred forty-one".