61263558812778 has 64 divisors (see below), whose sum is σ = 141984013121280. Its totient is φ = 17260800809472.

The previous prime is 61263558812767. The next prime is 61263558812789. The reversal of 61263558812778 is 87721885536216.

It is an interprime number because it is at equal distance from previous prime (61263558812767) and next prime (61263558812789).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20575425 + ... + 23363972.

It is an arithmetic number, because the mean of its divisors is an integer number (2218500205020).

Almost surely, 2^{61263558812778} is an apocalyptic number.

61263558812778 is an abundant number, since it is smaller than the sum of its proper divisors (80720454308502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61263558812778 is a wasteful number, since it uses less digits than its factorization.

61263558812778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43939871.

The product of its digits is 270950400, while the sum is 69.

The spelling of 61263558812778 in words is "sixty-one trillion, two hundred sixty-three billion, five hundred fifty-eight million, eight hundred twelve thousand, seven hundred seventy-eight".