61868638453 has 8 divisors (see below), whose sum is σ = 63039663288. Its totient is φ = 60697750464.

The previous prime is 61868638417. The next prime is 61868638457. The reversal of 61868638453 is 35483686816.

61868638453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 25684229169 + 36184409284 = 160263^2 + 190222^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61868638453 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 (61868638457) 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, 1734151 + ... + 1769467.

It is an arithmetic number, because the mean of its divisors is an integer number (7879957911).

Almost surely, 2^61868638453 is an apocalyptic number.

It is an amenable number.

61868638453 is a deficient number, since it is larger than the sum of its proper divisors (1171024835).

61868638453 is a wasteful number, since it uses less digits than its factorization.

61868638453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68423.

The product of its digits is 19906560, while the sum is 58.

The spelling of 61868638453 in words is "sixty-one billion, eight hundred sixty-eight million, six hundred thirty-eight thousand, four hundred fifty-three".