61678219201 has 3 divisors (see below), whose sum is σ = 61678467553. Its totient is φ = 61677970850.

The previous prime is 61678219181. The next prime is 61678219219. The reversal of 61678219201 is 10291287616.

The square root of 61678219201 is 248351.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 61678219201 - 2¹³ = 61678211009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61678219241) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 124176 + ... + 372526.

Almost surely, 2^61678219201 is an apocalyptic number.

61678219201 is the 248351-st square number.

61678219201 is the 124176-th centered octagonal number.

It is an amenable number.

61678219201 is a deficient number, since it is larger than the sum of its proper divisors (248352).

61678219201 is an frugal number, since it uses more digits than its factorization.

61678219201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496702 (or 248351 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 61678219201 in words is "sixty-one billion, six hundred seventy-eight million, two hundred nineteen thousand, two hundred one".