650624511661 has 8 divisors (see below), whose sum is σ = 664255929344. Its totient is φ = 637088753520.

The previous prime is 650624511659. The next prime is 650624511697. The reversal of 650624511661 is 166115426056.

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

It is not a de Polignac number, because 650624511661 - 2¹ = 650624511659 is a prime.

It is a super-2 number, since 2×650624511661² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650624511611) 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, 23901141 + ... + 23928346.

It is an arithmetic number, because the mean of its divisors is an integer number (83031991168).

Almost surely, 2^650624511661 is an apocalyptic number.

650624511661 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

650624511661 is a deficient number, since it is larger than the sum of its proper divisors (13631417683).

650624511661 is a wasteful number, since it uses less digits than its factorization.

650624511661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47829771.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 650624511661 in words is "six hundred fifty billion, six hundred twenty-four million, five hundred eleven thousand, six hundred sixty-one".