78255470137 has 8 divisors (see below), whose sum is σ = 85048289480. Its totient is φ = 71573103360.

The previous prime is 78255470081. The next prime is 78255470143. The reversal of 78255470137 is 73107455287.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 30984448576 + 47271021561 = 176024^2 + 217419^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 78255470137 - 2⁷ = 78255470009 is a prime.

It is a super-2 number, since 2×78255470137² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78255470147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27611664 + ... + 27614497.

It is an arithmetic number, because the mean of its divisors is an integer number (10631036185).

Almost surely, 2^78255470137 is an apocalyptic number.

It is an amenable number.

78255470137 is a deficient number, since it is larger than the sum of its proper divisors (6792819343).

78255470137 is a wasteful number, since it uses less digits than its factorization.

78255470137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55226283.

The product of its (nonzero) digits is 1646400, while the sum is 49.

The spelling of 78255470137 in words is "seventy-eight billion, two hundred fifty-five million, four hundred seventy thousand, one hundred thirty-seven".