642672623 has 2 divisors, whose sum is σ = 642672624. Its totient is φ = 642672622.

The previous prime is 642672557. The next prime is 642672661. The reversal of 642672623 is 326276246.

It is an a-pointer prime, because the next prime (642672661) can be obtained adding 642672623 to its sum of digits (38).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642672623 - 2¹⁶ = 642607087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642672523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321336311 + 321336312.

It is an arithmetic number, because the mean of its divisors is an integer number (321336312).

Almost surely, 2^642672623 is an apocalyptic number.

642672623 is a deficient number, since it is larger than the sum of its proper divisors (1).

642672623 is an equidigital number, since it uses as much as digits as its factorization.

642672623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 38.

The square root of 642672623 is about 25350.9886000527. The cubic root of 642672623 is about 862.9717916741.

It can be divided in two parts, 64267 and 2623, that multiplied together give a triangular number (168572341 = T₁₈₃₆₁).

The spelling of 642672623 in words is "six hundred forty-two million, six hundred seventy-two thousand, six hundred twenty-three".