61870193781 has 8 divisors (see below), whose sum is σ = 89993009184. Its totient is φ = 37497087120.

The previous prime is 61870193767. The next prime is 61870193789. The reversal of 61870193781 is 18739107816.

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

It is not a de Polignac number, because 61870193781 - 2⁶ = 61870193717 is a prime.

It is a super-2 number, since 2×61870193781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61870193789) 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 in 7 ways as a sum of consecutive naturals, for example, 937427146 + ... + 937427211.

It is an arithmetic number, because the mean of its divisors is an integer number (11249126148).

Almost surely, 2^61870193781 is an apocalyptic number.

It is an amenable number.

61870193781 is a deficient number, since it is larger than the sum of its proper divisors (28122815403).

61870193781 is a wasteful number, since it uses less digits than its factorization.

61870193781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874854371.

The product of its (nonzero) digits is 508032, while the sum is 51.

The spelling of 61870193781 in words is "sixty-one billion, eight hundred seventy million, one hundred ninety-three thousand, seven hundred eighty-one".