61218296501 has 4 divisors (see below), whose sum is σ = 61272521100. Its totient is φ = 61164071904.

The previous prime is 61218296453. The next prime is 61218296519. The reversal of 61218296501 is 10569281216.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7361811601 + 53856484900 = 85801^2 + 232070^2 .

It is a cyclic number.

It is not a de Polignac number, because 61218296501 - 2¹⁰ = 61218295477 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 (61218296551) 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, 27110606 + ... + 27112863.

It is an arithmetic number, because the mean of its divisors is an integer number (15318130275).

Almost surely, 2^61218296501 is an apocalyptic number.

It is an amenable number.

61218296501 is a deficient number, since it is larger than the sum of its proper divisors (54224599).

61218296501 is a wasteful number, since it uses less digits than its factorization.

61218296501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54224598.

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 61218296501 in words is "sixty-one billion, two hundred eighteen million, two hundred ninety-six thousand, five hundred one".