642612662149 has 4 divisors (see below), whose sum is σ = 670552343136. Its totient is φ = 614672981164.

The previous prime is 642612662147. The next prime is 642612662179. The reversal of 642612662149 is 941266216246.

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, and also an emirpimes, since its reverse is a distinct semiprime: 941266216246 = 2 ⋅470633108123.

It is a cyclic number.

It is not a de Polignac number, because 642612662149 - 2¹ = 642612662147 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642612662143) 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, 13969840459 + ... + 13969840504.

It is an arithmetic number, because the mean of its divisors is an integer number (167638085784).

Almost surely, 2^642612662149 is an apocalyptic number.

It is an amenable number.

642612662149 is a deficient number, since it is larger than the sum of its proper divisors (27939680987).

642612662149 is a wasteful number, since it uses less digits than its factorization.

642612662149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27939680986.

The product of its digits is 1492992, while the sum is 49.

The spelling of 642612662149 in words is "six hundred forty-two billion, six hundred twelve million, six hundred sixty-two thousand, one hundred forty-nine".