19650986649 has 48 divisors (see below), whose sum is σ = 33090550272. Its totient is φ = 11004349824.

The previous prime is 19650986617. The next prime is 19650986657. The reversal of 19650986649 is 94668905691.

19650986649 is a `hidden beast` number, since 1 + 9 + 6 + 509 + 86 + 6 + 49 = 666.

It is not a de Polignac number, because 19650986649 - 2⁵ = 19650986617 is a prime.

It is a super-2 number, since 2×19650986649² (a number of 21 digits) contains 22 as substring.

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 not an unprimeable number, because it can be changed into a prime (19650986659) 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, 3326032 + ... + 3331934.

It is an arithmetic number, because the mean of its divisors is an integer number (689386464).

Almost surely, 2^19650986649 is an apocalyptic number.

It is an amenable number.

19650986649 is a deficient number, since it is larger than the sum of its proper divisors (13439563623).

19650986649 is a wasteful number, since it uses less digits than its factorization.

19650986649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6966 (or 6963 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 63.

The spelling of 19650986649 in words is "nineteen billion, six hundred fifty million, nine hundred eighty-six thousand, six hundred forty-nine".