55781077378 has 8 divisors (see below), whose sum is σ = 90107894268. Its totient is φ = 25745112624.

The previous prime is 55781077337. The next prime is 55781077409. The reversal of 55781077378 is 87377018755.

It can be written as a sum of positive squares in 2 ways, for example, as 41945907249 + 13835170129 = 204807^2 + 117623^2 .

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

It is a super-2 number, since 2×55781077378² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1072713001 + ... + 1072713052.

Almost surely, 2^55781077378 is an apocalyptic number.

55781077378 is a deficient number, since it is larger than the sum of its proper divisors (34326816890).

55781077378 is a wasteful number, since it uses less digits than its factorization.

55781077378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145426068.

The product of its (nonzero) digits is 11524800, while the sum is 58.

The spelling of 55781077378 in words is "fifty-five billion, seven hundred eighty-one million, seventy-seven thousand, three hundred seventy-eight".