71503378978 has 4 divisors (see below), whose sum is σ = 107255068470. Its totient is φ = 35751689488.

The previous prime is 71503378963. The next prime is 71503378981. The reversal of 71503378978 is 87987330517.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 48577482409 + 22925896569 = 220403^2 + 151413^2 .

It is a super-2 number, since 2×71503378978² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 17875844743 + ... + 17875844746.

Almost surely, 2^71503378978 is an apocalyptic number.

71503378978 is a deficient number, since it is larger than the sum of its proper divisors (35751689492).

71503378978 is a wasteful number, since it uses less digits than its factorization.

71503378978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35751689491.

The product of its (nonzero) digits is 8890560, while the sum is 58.

The spelling of 71503378978 in words is "seventy-one billion, five hundred three million, three hundred seventy-eight thousand, nine hundred seventy-eight".