78148426723754 has 4 divisors (see below), whose sum is σ = 117222640085634. Its totient is φ = 39074213361876.

The previous prime is 78148426723751. The next prime is 78148426723777. The reversal of 78148426723754 is 45732762484187.

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., 41385122998129 + 36763303725625 = 6433127^2 + 6063275^2 .

It is a super-2 number, since 2×78148426723754² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78148426723751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19537106680937 + ... + 19537106680940.

Almost surely, 2^{78148426723754} is an apocalyptic number.

78148426723754 is a deficient number, since it is larger than the sum of its proper divisors (39074213361880).

78148426723754 is a wasteful number, since it uses less digits than its factorization.

78148426723754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39074213361879.

The product of its digits is 505774080, while the sum is 68.

The spelling of 78148426723754 in words is "seventy-eight trillion, one hundred forty-eight billion, four hundred twenty-six million, seven hundred twenty-three thousand, seven hundred fifty-four".