64428237493 has 2 divisors, whose sum is σ = 64428237494. Its totient is φ = 64428237492.

The previous prime is 64428237371. The next prime is 64428237541. The reversal of 64428237493 is 39473282446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63072304164 + 1355933329 = 251142^2 + 36823^2 .

It is a cyclic number.

It is not a de Polignac number, because 64428237493 - 2²¹ = 64426140341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64428237493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64428247493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32214118746 + 32214118747.

It is an arithmetic number, because the mean of its divisors is an integer number (32214118747).

Almost surely, 2^64428237493 is an apocalyptic number.

It is an amenable number.

64428237493 is a deficient number, since it is larger than the sum of its proper divisors (1).

64428237493 is an equidigital number, since it uses as much as digits as its factorization.

64428237493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6967296, while the sum is 52.

The spelling of 64428237493 in words is "sixty-four billion, four hundred twenty-eight million, two hundred thirty-seven thousand, four hundred ninety-three".